Tomography using monochromatic thermal neutrons with attenuation and phase contrast

Francois Dubus; Ulrich Bonse; Theodor Biermann; Matthias Baron; Felix Beckmann; Michael Zawisky

doi:10.1117/12.452864

7 January 2002 Tomography using monochromatic thermal neutrons with attenuation and phase contrast

Francois Dubus, Ulrich Bonse, Theodor Biermann, Matthias Baron, Felix Beckmann, Michael Zawisky

Proceedings Volume 4503, Developments in X-Ray Tomography III; (2002) https://doi.org/10.1117/12.452864
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Attenuation-contrast tomography with monochromatic thermal neutrons was developed and operated at guide station S18 of the institute Laue-Langevin in Grenoble. From the S18 spectrum the neutron wavelength (lambda) equals 0.18 nm was selected by employing a fore crystal with the silicon 220 reflection at a Bragg angle (Theta) equals 30 degrees. Projections were registered by a position sensitive detector (PSD) consisting of a neutron-to-visible-light converter coupled to a CCD detector. Neutron tomography and its comparison with X-ray tomography is studied. This is of special interest since the cross section for neutron attenuation ((sigma) _atom) and the cross section for neutron phase shift (b_c) are isotope specific and, in addition, by no means mostly monotonous functions of atomic number Z as are attenuation coefficient ((mu) _x) and atomic scattering amplitude (f) in the case of X-rays. Results obtained with n-attenuation tomography will be presented. Possibilities and the setup of an instrument for neutron phase-contrast tomography based on single-crystal neutron interferometry will be described.

Citation Download Citation

Francois Dubus, Ulrich Bonse, Theodor Biermann, Matthias Baron, Felix Beckmann, and Michael Zawisky "Tomography using monochromatic thermal neutrons with attenuation and phase contrast", Proc. SPIE 4503, Developments in X-Ray Tomography III, (7 January 2002); https://doi.org/10.1117/12.452864

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